diff --git a/telethon/client/auth.py b/telethon/client/auth.py
index f310f5d3..94062d03 100644
--- a/telethon/client/auth.py
+++ b/telethon/client/auth.py
@@ -351,6 +351,7 @@ class AuthMethods(MessageParseMethods, UserMethods):
 
         Returns the input user parameter.
         """
+        self._bot = bool(user.bot)
         self._self_input_peer = utils.get_input_peer(user, allow_self=False)
         self._authorized = True
 
@@ -413,6 +414,7 @@ class AuthMethods(MessageParseMethods, UserMethods):
         except errors.RPCError:
             return False
 
+        self._bot = None
         self._self_input_peer = None
         self._authorized = False
         self._state = types.updates.State(0, 0, datetime.datetime.now(), 0, 0)
diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index 0f111f9a..d048c492 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -289,6 +289,7 @@ class TelegramBaseClient(abc.ABC):
 
         # Sometimes we need to know who we are, cache the self peer
         self._self_input_peer = None
+        self._bot = None
 
     # endregion
 
diff --git a/telethon/client/users.py b/telethon/client/users.py
index 18c9c9d1..42581f98 100644
--- a/telethon/client/users.py
+++ b/telethon/client/users.py
@@ -110,6 +110,7 @@ class UserMethods(TelegramBaseClient):
             me = (await self(
                 functions.users.GetUsersRequest([types.InputUserSelf()])))[0]
 
+            self._bot = me.bot
             if not self._self_input_peer:
                 self._self_input_peer = utils.get_input_peer(
                     me, allow_self=False
@@ -119,6 +120,15 @@ class UserMethods(TelegramBaseClient):
         except errors.UnauthorizedError:
             return None
 
+    async def is_bot(self):
+        """
+        Return ``True`` if the signed-in user is a bot, ``False`` otherwise.
+        """
+        if self._bot is None:
+            self._bot = (await self.get_me()).bot
+
+        return self._bot
+
     async def is_user_authorized(self):
         """
         Returns ``True`` if the user is authorized.